Quartz mill



May 15, 1928.

J.- B. PRATT QUARTZ mm.

Filed July as, 1925 2 Sheets-Sheet 1 May 15, 1928. l.670,005 J. B. PRATT QUARTZ MILL Filed July 23, 1925 2 Sheets-Sheet 2 Patented May 15, 1928.

- =amas BURTON PRATT, or FORT Jonns, CALIFORNIA.

, oima'rz mm. ,7

n iuie afloh filed July 23, 19 25. seriainm iaew.

The present invention relates to a crushing millfor quartz used in the process of concentration, and has for its object to provide an improved discharge end, which will insure the delivery of crushed ore at a uniform fineness In the drawing: Figure. 1 is a side embodying the features of my invention. Figure 2 is a longitudinal section therethrough.

Figure?) is an end elevation thereof, and Figure 4 is anotherv end elevation thereof,

showing portions in section.

Referrmg to the drawing in detail, itwill be seenthatl designates a drum having an end- 2 therein,and' also having myiinproved end indicated generally, by'the letter A, in the other end thereof. The end 2 has *the central opening 3, which registers with the; bore of'the hollowshaft' 4, journaled as at 5, and fixedtothe end 2. This hollow shaftforms an entrance for the ore to the drum 1.' In the druinl there is adaptedto'be disposed the well-known crushing bars (not shown) so that the ore will be crushed upon rotation of the drum. i

Particular attention is now called to my improved end A. The numeral 6 designates a disc having a centrally disposedhub 7 which is reduced at its end, as at 8, to form an annular shoulder 9". A plurality of partition plates are arranged to extend rectangularly on, the outer surface of the disc 6 and are indicated by the numeral 9. These plates radiate from the hub 7 and the outer edges thereof taper inwardly. These plates 9 form compartments Indicated by the letters 13. In each compartment B the disc 6 is provided with a plurality of rows of openings 10, of a relatively small gage and an opening 11, of a large gage, ad acent the hub, it being noted that the rows of open ngs 10 start adjacent the edge of the disc and are concentrically arranged, the inner row being disposed an appreciable distance from the opening 11. A screen band 12 of foraminous material of a suitable gage is disby bolts 13*, Figure 1. A plurality of clo sure plates 14 extend between the hub 7, at

the shoulder 9 and the band 12, there being one plate over each compartment B. A

elevation of the mill I s w s fine: enough will 'passthrough the screen 'tially asis indicated ,to advantage in Figshaft 15 extends co-airially frointhe hub 7, V

in journals 16; and maybe driven in any suitable manner. 'Asfthe ore is fed through the hollow shaft 4 into the rotating drum 1, it is crushed. by the, usual' crushing bars (not shown) in' the Well "known manner. The

crushed ore'will pass throughthe openings 10 into the compartments B. The ore which band from the bottom com 'iartment, whereas the ore which is not fineqenough will bemoved around the axis ofthe drum until,

the compartment isjabove the axisfand the, ore will flow back through the opening 11 into the-drum to be recrushed. A supply of closure plates118 are used, in association with the openings 10." These plates will befur I v nished in different sizes, varyingsubstanure '4, so that any number of the rows of openings 10 may be closed. These plates 18 hold the sand'back" in the mill or drum, and allow it to be thoroughly amalgamated inside the "drum; In practice, approximately 9 0%fof the Valuesare kept inside the drum, very littleget's'out of the dis charge end, and what does, is caught on the plates. If the operator desires to retain more of the sand in the drum, 'he puts on wider plates. This decreases the capacity to some extent, but holds back the sand. If

suit the conditions. M

It is thought that the I eration, and advantages of this invention can be raised quite. high, and adjusted to invention has been disclosed merely by way I of example, and attains all of the features the operator is running rich ore, the plates v will be clearly understood and appreciated i I of advantage enumerated as desirable in the statement of the invention and the above description. It is apparent that numerous changes in'the details of construction, in the sizes, and in the combination and arrangementof parts may be resorted to with out departing from the spirit or scopejof 'the invention as hereinafter claimed or sacrificing any of its-advantages.

Having thus described my invention, what i I claim as new is:

1. A'Inill of the class described including a drum, a discharge end in the drum comprising a disc having a centrally located 90 construction, op-

hub, partitions radiating from the hub to form compartments, said disc provided-with a plurality or rows of openings in each compartment, and a single opening in each cornpartment adjacent the hub, the single opening being relatively large in comparison with the other openings, closure plates over the outer sides of the partitions, a foraminous band disposed about the outer endsof the partitions; v i

p 2. A mill of the class described including a drum, a discharge end in the drum comprising a disc having a centrally located hub,

partitions radiating from 'the hubto' form compartments, said disc provided with a" plurality of rows of openings in each compartinent, and a single .opening in each compartment adjacent the hub, and inclined inwardly toward the center of the drum,

the single opening being relativ'ely'large in comparison with the other openings, closure plates over the outer sides of the partitions,

a forami'nous band disposed about the outer ends of the partitions, and closure plates adapted to be placedover a desired number] of roivs of the smaller openings in the disc;

3. An end structure fora mill drum "including a disc having a hub portion reduced to form an annular shoulder intermediate its ends, partitions "extending radially from the hub and rectangular ly from the outer surface of the. disc, closure plates on the outer sides of the partitions being engaged against the annular shoulder, a foraminous to form an annular shoulder intermediate its ends, partitions extending radially from the hub" and rectangular from the outer sure face of the disc, closure plates on the outer. sides of the partitions being engaged against the annular shoulder, a foraminous band disposed about the outer end ofthepartitions, said partitions forming compartments,

said discs provided-,vvith a' plurality of rela-f a tively' small openings in the outer portion of the compartment, and a single relatively 55 large opening in the inner portion o' f-cthe compartment, and adjustableclosure plates for the relatively small openings.

5.'A drum having a discharge 'end, said I end made up 'of a disk having a series of openings about and adjacent to its center, compartments disposed at the outer side of the disk with each compartment in communication with one of said openings, and, an annulus surrounding the said 'compart mentand having interstices In testimony whereof I aflix my signature 7 JAMES BURTON rnn'rr. 

